Replace the side-B attack with the Sonic boost. The move Sonic uses in Sonic Unleashed, Sonic Colors and Sonic Generations.
Picture: http://images4.wikia.nocookie.net/__...st_sonic_2.png
http://images3.wikia.nocookie.net/__...s_ARK_Race.jpg
http://images3.wikia.nocookie.net/__...-56-56-083.png
YouTube: http://www.youtube.com/watch?v=2y5k6t3ieuU
http://www.youtube.com/watch?v=OCJLO4sdC_c
Wiki: http://sonic.wikia.com/wiki/Sonic_Boost
Picture: http://images4.wikia.nocookie.net/__...st_sonic_2.png
http://images3.wikia.nocookie.net/__...s_ARK_Race.jpg
http://images3.wikia.nocookie.net/__...-56-56-083.png
YouTube: http://www.youtube.com/watch?v=2y5k6t3ieuU
http://www.youtube.com/watch?v=OCJLO4sdC_c
Wiki: http://sonic.wikia.com/wiki/Sonic_Boost